Relevant to the first book, but last year and this year have been awesome for women's achievement in ultrarunning:
- Last year Courtney Dauwalter won the three most iconic trail ultras in a single season, when most professional runners will only target one. I've seen a lot of people consider this to be the single most impressive trail running performance by any athlete. https://run.outsideonline.com/trail/trail-racing/film-about-...
At shorter distances, Sifan Hassan also pulled off a triple-medal performance (bronze at 5000 and 10000, gold at marathon) at the Olympics that hasn't happened in 70 years and most people thought would be impossible in the modern era of professionalized and specialized running.
Pretty sure she was the first place finisher overall. I am not sure how much of a gender advantage there is over those distances. Similarly, age is less of a factor too, with older athletes regularly beating those who are a decade younger.